Introduce a bulk_post_updated_messages filter.

props johnbillion for initial patch.
fixes #18710.

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In wp_count_posts(), rename 'count_posts' hook to 'wp_count_posts', for clarity. see #16603.

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Introduce a wp_count_attachments filter.

props kevinB.
fixes #17071.

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Temporary hooks for the widgets feature team in dynamic_sidebar() and is_active_sidebar().

props westonruter.
fixes #25368.

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Use correct variable. props helen. see #17071.

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Change 'This post is password protected' to 'This content', for the benefit of custom post types.

props MikeHansenMe.
fixes #23603.

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Return false in update_metadata() and update_metadata_by_mid() when the DB query fails.

props leewillis77.
fixes #24933.

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Inline documentation for hooks in wp-includes/comment-template.php.

Fixes #25396.

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Avoid a notice. see #14408, [25574].

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Standardize usage of 'text domain' in inline documentation for wp-includes/l10n.php.

Props ericlewis, SergeyBiryukov.
Fixes #16750.

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Inline documentation for hooks in wp-admin/includes/revision.php.

Fixes #25283.

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Inline documentation for the Walker_Comment class in wp-includes/comment-template.php

Fixes #25388.

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Inline documentation for hooks in wp-admin/admin-post.php.

Props ericlewis, kpdesign.
Fixes #25361.

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